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dc.contributor.authorSegarra Ortí, Carlos
dc.contributor.authorClimente Plasencia, Joan Ignasi
dc.contributor.authorPolovitsyn, Anatolii
dc.contributor.authorRajadell Viciano, Fernando
dc.contributor.authorMoreels, Iwan
dc.contributor.authorPlanelles Fuster, Josep
dc.identifier.citationSEGARRA, Carlos, et al. Piezoelectric Control of the Exciton Wave Function in Colloidal CdSe/CdS Nanocrystals. The journal of physical chemistry letters, 2016, vol. 7, p. 2182-2188ca_CA
dc.description.abstractUsing multiband k·p calculations, we show that strain-engineered piezoelectricity is a powerful tool to modulate the electron−hole spatial separation in a wide class of wurtzite CdSe/CdS nanocrystals. The inherent anisotropy of the hexagonal crystal structure leads to anisotropic strain and, consequently, to a pronounced piezoelectric field along the c axis, which can be amplified or quenched through a proper design of the core−shell structure. The use of large cores and thick shells promotes a gradual departure from quantum confined nanocrystals to a regime dominated by piezoelectric confinement. This allows excitons to evolve from the usual type-I and quasi-type-II behavior to a type-II behavior in dot-in-dots, dot-in-rods, rod-in-rods, and dot-in-plates. Piezoelectric fields explain experimental observations for giant-shell nanocrystals, whose time-resolved photoluminescence reveals long exciton lifetimes for large cores, contrary to the expectations of standard quantum confinement models. They also explain the large differences in exciton lifetimes reported for different classes of CdSe/CdS nanocrystals.ca_CA
dc.description.sponsorShipSupport from MINECO project CTQ2014-60178-P, UJI project P1-1B2014-24 and a FPU grant (C.S.) is acknowledged. The present publication is further realized with the support of the Ministero degli Affari Esteri e della Cooperazione Internazionale (IONX-NC4SOL, I.M.).ca_CA
dc.format.extent7 p.ca_CA
dc.publisherAmerican Chemical Societyca_CA
dc.relation.isPartOfThe journal of physical chemistry letters, 2016, vol. 7ca_CA
dc.rightsCopyright © 2016 American Chemical Society ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.ca_CA
dc.subjectCrystal structureca_CA
dc.subjectSemiconductor quantum wellsca_CA
dc.subjectWave functionsca_CA
dc.subjectZinc sulfideca_CA
dc.subjectCore shell structureca_CA
dc.subjectHexagonal crystal structureca_CA
dc.subjectInherent anisotropyca_CA
dc.subjectPiezo-electric fieldsca_CA
dc.subjectPiezoelectric controlca_CA
dc.subjectQuantum confinement modelsca_CA
dc.subjectSpatial separationca_CA
dc.subjectTime-resolved photoluminescenceca_CA
dc.titlePiezoelectric Control of the Exciton Wave Function in Colloidal CdSe/CdS Nanocrystalsca_CA

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